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We re-explore the symmetries of a weakly isolated horizon (WIH) from theperspective of freedom in the choice of intrinsic data. The supertranslationsare realized as additional symmetries. Further, it is shown that all smoothvector fields tangent to the cross-sections are Hamiltonian. We show thatjoining two WIHs which differ in these Hamiltonians and boundary data, underthe action of a supertranslation, necessarily require the inclusion of anintermediate dynamical phase, possibly with the inclusion of a stress energytensor. This phase of the boundary is non-expanding but not a WIH andinvariably leads to a violation of the dominant energy condition. Theassumptions made allow us to reconstruct the (classically) pathological stressenergy tensor also.

On Super-Translation transition between Quasi-local Black holes